SL2410
System Logic
Semiconductor
SLS
Tone Ringer
The SL2410 is a bipolar integrated circuit designed for telephone bell
replacement.
Designed for Telephone Bell Replacement
Low Curent Drain
Adjustable 2-frequency Tone
Adjustable Warbling Rate
Extension Tone Ringer Modules
Alarms or Other Alerting Devices
External Triggering or Ringer Disable
Built-in hysteresis prevents false triggering and rotary dial `Chirps'
ORDERING INFORMATION
SL2410N Plastic
SL2410D SOIC
T
A
= -45
to 65
C
for package
PIN ASSIGNMENT
LOGIC DIAGRAM
PIN 1 = V
CC
PIN 5 = GND
1. Output amplifier
2. High frequency oscillator
3. Low frequency oscillator
4. Hysteresis regulator
(Regulator circuit has built-in hysteresis to prevent false
triggering and rotary dial "Chirps")
SL2410
System Logic
Semiconductor
SLS
PIN DESCRIPTION
NAME
PIN
DESCRIPTION
V
CC
1
Positive power supply.
RE
2
Initiation of oscillation start input
LFI
3
Low frequency oscillator input
LF0
4
Low frequency oscillator output
GND
5
Negative power supply
HF0
6
High frequency oscillator output
HFI
7
High frequency oscillator input
OUT
8
Tone output
MAXIMUM RATINGS
*
Symbol
Parameter
Value
Unit
V
CC
DC Supply Voltage (Referenced to GND)
to +30.0
V
P
D
Power Dissipation in Still Air, Plastic DIP
400
mW
Tstg
Storage Temperature
-65 to +150
C
*
Maximum Ratings are those values beyond which damage to the device may occur.
Functional operation should be restricted to the Recommended Operating Conditions.
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Min
Max
Unit
V
CC
DC Supply Voltage (Referenced to GND)
13.0
29.0
V
T
A
Operating Temperature
-45
+65
C
This device contains protection circuitry to guard against damage due to high static voltages or electric
fields. However, precautions must be taken to avoid applications of any voltage higher than maximum rated
voltages to this high-impedance circuit. For proper operation, V
IN
and V
OUT
should be constrained to the range
GND
(V
IN
or V
OUT
)
V
CC
.
Unused inputs must always be tied to an appropriate logic voltage level (e.g., either GND or V
CC
).
Unused outputs must be left open.
SL2410
System Logic
Semiconductor
SLS
ELECTRICAL CHARACTERISTICS
(Voltages Referenced to GND, T
A
= -45 to +65
C)
Guaranteed Limits
Symbol
Parameter
Test Conditions
Min
Typ
Max
Unit
V
SI
Initiation Supply Voltage
(1)
See Fig. 1
16.8
21.2
V
I
SI
Initiation Supply Current
(1)
1.4
4.2
mA
V
SUS
Sustaining Voltage (2)
See Fig. 1
9.5
12.2
V
I
SUS
Sustaining Current (2)
No Load V
CC
=V
SUS
See Fig. 1
0.7
2.5
mA
V
TR
Trigger Voltage (3)
V
CC
=15V
8.8
12.2
V
I
TR
Trigger Current (3,5)
V
CC
=15V
5.0
1000
A
V
DIS
Disable Voltage (4)
V
CC
=21V
-
0.7
V
I
DIS
Disable Current (4)
V
CC
=15V
-20
-
A
V
OH
High-Level Output
Voltage
V
CC
=21V, I
OH
=-15mA, Pin
6=6V, Pin 7=GND
16.7
21.0
V
V
OL
Low-Level Output
Voltage
V
CC
=21V, I
OL
=15mA, Pin
6=GND, Pin 7=6V
-
1.8
V
I
IN
Maximun Input Leakage
Current (Pin 3)
Pin 3=6V,
Pin 4=GND, V
CC
=21V
-
1.0
A
(Pin 7)
Pin 7=6V,
Pin 6=GND, V
CC
=21V
-
1.0
A
f
H1
High Frequency 1
R
3
=191K
,C
3
=6800pF
461
563
Hz
f
H2
High Frequency 2
R
3
=191K
,C
3
=6800pF
576
704
Hz
f
L
Low Frequency
R
2
=165K
, C
2
=0.47
F
9.0
11.0
Hz
Notes:
1. Initiation supply voltage (V
SI
) is the supply voltage required to start the tone ringer oscillating.
2. Sustaining voltage (V
SUS
) is the supply voltage required to maintain oscillation.
3. V
TR
and I
TR
are the conditions applied to trigger in to start oscillation for V
SUS
V
CC
V
SI
.
4. V
DIS
and I
DIS
are the conditions applied to trigger in to inhibit oscillation for V
SI
V
CC
.
5. Trigger current must be limited to this value ext ernally.
SL2410
System Logic
Semiconductor
SLS
CIRCUIT CURRENT-SUPPLY VOLTAGE (NO LOAD)
Figure 1
APPLICATION CIRCUIT
Figure 2
SL2410
System Logic
Semiconductor
SLS
APPLICATION NOTE
The application circuit illustrates the use of the SL2410 devices in typical telephone or extension tone ringer
application.
The AC ringer signal voltage appears across the TIP and RING inputs of the circuit and is attenuated by
capacitor C
1
and resistor R
1
.
C
1
also provides isolation from DC voltages (48V) on the exchange line.
After full wave rectification by the bridge diode, the waveform is filtered by capacitor C
4
to provide a DC supply
for the tone ringer chip.
As this voltage exceeds the initiation voltage (V
SI
), oscillation starts.
With the components shown, the ouptut frequency chops between 512(f
h1
) and 640Hz(f
h2
) at a 10Hz(f
L
) rate.
The loudspeaker load is coupled through a 1300
to 8
ransformer.
The output coupling capacitor C
5
is required with transformer coupled loads.
When driving a piezo-ceramic transducer type load, the coupling C
5
and transformer (1300
:8
) are not required.
However, a current limiting resistor is required.
The low frequency oscillator oscillates at a rate (f
L
) controlled by an external resistor (R
2
) and capacitor (C
2
).
The frequency can be determined using the relation f
L
=1/1.289R
2
xC
2
. The high frequency oscillates at a f
H1
, f
H2
controlled by an external resistor (R
3
) and capacitor (C
3
). The frequency can be determined using the relation
f
H1
=1/1.504R
3
xC
3
, f
H2
=1/1.203R
3
xC
3
.
TRIGGERING SL2410 FROM CMOS OR TTL LOGIC
Figure 3
Figure 4
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